DSH 631A Testing of abnormal conditions of dc motors in secondary circuits

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DSH 631A ; s! E8 t: B3 ^! z9 m% q

Testing of abnormal conditions of dc motors in secondary circuits + @. N; k$ G+ [

5.3.2, Annex B

60950-1(ed.1) & 60950-1(ed.2) 4 G4 [6 @9 c4 J- Q0 X" Q

Standard(s):
IEC 60950-1:2001 IEC 60950-1:2005
Sub clause(s):
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Subject:
! ~0 H/ Z; U4 t" o6 w* u) S$ M0 QTesting of abnormal conditions of dc motors in secondary circuits.
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DC fan, overload, Annex B
Approved by the 45th CTL Plenary Meeting 2008
6 r, ~, S6 B. M" iQuestion:
1. Is the test as described in Annex B.6 required for small dc motors (e.g. fans used in notebooks or power supplies)?
1 T0 u9 _: ^3 z, _& v2. Is it permitted to skip the limit temperatures of Tables B.1 and B.2 for dc motors in SELV circuits (following the second dashed paragraph of NOTE to subclause 5.3.2)?
Decision:
1. Yes, the test is required, except for motors associated with air handling (fans). Note -This is in line with the proposed modification of B.1 for Amd.1 to IEC 60950-1.
# T- y8 \" l! W& f: ^% Z2. Yes, it is permitted for such dc motors to exceed the limit temperatures of Tables B.1 and B.2 during tests of subclauses B.6 and B.7.
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